function MM_findObj2(n, d) //v4.0
{ 
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

var foundnorth = MM_findObj2 ("north");
    foundnorth.style.display = "block";

var foundeast = MM_findObj2 ("east");
    foundeast.style.display = "block";

var foundsouth = MM_findObj2 ("south");
    foundsouth.style.display = "block";

var foundwest = MM_findObj2 ("west");
    foundwest.style.display = "block";

function changeformlayer(value)
{
  if (value == "north")
  {
    foundnorth.style.display = "block";
    foundeast.style.display = "none";
    foundsouth.style.display = "none";
    foundwest.style.display = "none";
  }
  else if (value == "east")
  {
    foundnorth.style.display = "none";
    foundeast.style.display = "block";
    foundsouth.style.display = "none";
    foundwest.style.display = "none";
  }
  else if (value == "south")
  {
    foundnorth.style.display = "none";
    foundeast.style.display = "none";
    foundsouth.style.display = "block";
    foundwest.style.display = "none";
  }
  else if (value == "west")
  {
    foundnorth.style.display = "none";
    foundeast.style.display = "none";
    foundsouth.style.display = "none";
    foundwest.style.display = "block";
  }
  else
  {
    foundnorth.style.display = "none";
    foundeast.style.display = "none";
    foundsouth.style.display = "none";
    foundwest.style.display = "none";
  }
}